diff --git a/cluster-autoscaler/simulator/drainability/rules/replicacount/rule.go b/cluster-autoscaler/simulator/drainability/rules/replicacount/rule.go
index c256c53b56a75abb1c604d5f5c5543e8a924f16c..4ae35767f2c49d482555ce2f9fcf5a08e9b40f24 100644
--- a/cluster-autoscaler/simulator/drainability/rules/replicacount/rule.go
+++ b/cluster-autoscaler/simulator/drainability/rules/replicacount/rule.go
@@ -111,6 +111,11 @@ func (r *Rule) Drainable(drainCtx *drainability.DrainContext, pod *apiv1.Pod, _
 			return drainability.NewBlockedStatus(drain.ControllerNotFound, fmt.Errorf("replication controller for %s/%s is not available, err: %v", pod.Namespace, pod.Name, err))
 		}
 	} else if refKind == "StatefulSet" {
+		if refGroup.Group != "apps" {
+			// We don't have a listener for the other StatefulSet group.
+			return drainability.NewUndefinedStatus()
+		}
+
 		ss, err := drainCtx.Listers.StatefulSetLister().StatefulSets(controllerNamespace).Get(controllerRef.Name)
 
 		if err != nil && ss == nil {
diff --git a/cluster-autoscaler/simulator/drainability/rules/replicacount/rule_test.go b/cluster-autoscaler/simulator/drainability/rules/replicacount/rule_test.go
index 8a98be0acc687dc1b25eaf966780a0b98b4718ba..74a55973e3453f5bbe0c75fdf8bf99990dfa0040 100644
--- a/cluster-autoscaler/simulator/drainability/rules/replicacount/rule_test.go
+++ b/cluster-autoscaler/simulator/drainability/rules/replicacount/rule_test.go
@@ -243,6 +243,30 @@ func TestDrainable(t *testing.T) {
 			wantReason: drain.ControllerNotFound,
 			wantError:  true,
 		},
+		"SS-managed pod by a custom API Group": {
+			pod: &apiv1.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:            "bar",
+					Namespace:       "default",
+					OwnerReferences: test.GenerateOwnerReferences(statefulset.Name, "StatefulSet", "kruise/v1", ""),
+				},
+				Spec: apiv1.PodSpec{
+					NodeName: "node",
+				},
+			},
+		},
+		"SS-managed pod by a custom API Group with missing reference": {
+			pod: &apiv1.Pod{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:            "bar",
+					Namespace:       "default",
+					OwnerReferences: test.GenerateOwnerReferences("missing", "StatefulSet", "kruise/v1", ""),
+				},
+				Spec: apiv1.PodSpec{
+					NodeName: "node",
+				},
+			},
+		},
 		"RS-managed pod": {
 			pod: &apiv1.Pod{
 				ObjectMeta: metav1.ObjectMeta{